Buying Guide for Air Purifiers in India

Published 2 February 2023

In recent years, India has faced severe air quality issues, particularly in urban and industrialized regions. The alarming levels of pollutants, including fine particulate matter (PM2.5) and toxic gases, have raised significant health concerns.

One viable solution to improve indoor air quality is the use of air purifiers. These devices can help maintain a healthy environment in homes, offices, and other indoor spaces. However, choosing an air purifier can be a daunting task due to the numerous models and types available in the market.

This practical guide from the HNK team will help you in buying the right air purifier for your needs.

Understanding Air Purifiers

Firstly, understanding the necessity of an air purifier is crucial. In India, where pollution levels often exceed the World Health Organization’s safe limits, air purifiers are no longer a luxury but a necessity.

They help eliminate harmful pollutants such as dust, pollen, bacteria, virus, mould spores, pet dander, smoke, and volatile organic compounds (VOCs) from indoor air.

Air purifiers are especially useful for individuals suffering from allergies, asthma, or other respiratory conditions, as they filter out allergens and irritants that can trigger symptoms.

Additionally, homes with smokers, pets, or high levels of dust can benefit significantly from using air purifiers.

Technologies in Air Purifiers

Before we delve deeper into the buying guide, it’s essential to understand the different technologies used in air purifiers.

High-Efficiency Particulate Air (HEPA) Filters

This technology is considered the gold standard in air purification.

True HEPA filters can capture up to 99.97% of airborne particles as small as 0.3 microns, including dust, pollen, and mould spores. However, they’re unable to remove gases, odours, or chemicals.

Activated Carbon Filters

These filters are adept at trapping odours, gases, and VOCs. They work by adsorption, a chemical reaction where certain substances are attracted to activated carbon and bond with it.

Activated carbon filters are often used in combination with HEPA filters for a more comprehensive filtration solution.

Ionic Filters or Ionizers

These purifiers work by emitting a cloud of charged ions into the air that bond with airborne particles, increasing their weight and causing them to settle.

While they can handle smaller particles than HEPA filters, they don’t actually remove the pollutants from the environment. Also, some ionizers produce ozone, a lung irritant.

Ultraviolet Germicidal Irradiation (UVGI)

UVGI purifiers use UV-C light to kill or neutralize airborne microorganisms like bacteria, viruses, and mould. However, they’re not efficient at removing particulates or gases.

Photocatalytic Oxidation (PCO)

These purifiers use UV light in conjunction with a catalyst (usually titanium dioxide) to oxidize gases, breaking them down into harmless substances. While effective against gases and odours, PCO isn’t as efficient at particle removal as HEPA filters.

Electrostatic Precipitators

These purifiers use an electrical charge to collect airborne particles. However, like ionizers, they can produce ozone.

What to Consider When Buying an Air Purifier

Before purchasing an air purifier, consider the following factors:

Room Size

The effectiveness of an air purifier is tied to the size of the room it serves. Too small, and it won’t clean the air effectively; too large, and you’re wasting energy.

Check the purifier’s Clean Air Delivery Rate (CADR), which tells you how much filtered air the purifier delivers. Higher CADR ratings indicate more efficient filtration.

Filter Type

Consider your primary reason for purchasing an air purifier—whether it’s to remove allergens, combat asthma, reduce smoke or odours, or another concern. This will dictate the type of filter technology best suited to your needs.

Noise Level

Some air purifiers can be quite loud, particularly on higher settings. Check the noise level (measured in decibels, dB) to ensure it won’t disrupt your daily activities or sleep.

Energy Consumption

An air purifier is a device that will be running for long periods, so consider its energy efficiency. Look for Energy Star-rated models, which are 40% more energy-efficient than standard models.

Filter Replacement Cost and Frequency

The cost of maintaining an air purifier includes the expense of replacing filters regularly. Check how often the filters need to be replaced and their cost. Some purifiers have washable filters, which can save money over time.

Additional Features

Consider whether features such as air quality indicators, filter change indicators, multiple fan speeds, programmable timers, remote controls, or smart functionality are important to you.

These features can add convenience but may also increase the cost.


Certifications from bodies like the Association of Home Appliance Manufacturers (AHAM), the European Centre for Allergy Research Foundation (ECARF), and the British Allergy Foundation provide reassurances about an air purifier’s performance and efficiency.

Popular Air Purifier Brands in India

A host of brands offer air purifiers in India. Some of the popular ones are Philips, Honeywell, Dyson, Mi Xiaomi, Blue Star and Coway.

Investing in an air purifier is an important decision, as it directly impacts the health and well-being of you and your family. Always remember to consider factors such as the type and size of the space, the specific air quality issues you’re facing, the filter types and technologies used, energy efficiency, noise levels, maintenance costs, and product certifications.

Discover the Best Air Purifiers in India

Through careful consideration and comparison, you can find an air purifier that will help create a healthier indoor environment. With the above information, you should be equipped to make an informed choice that best suits your needs.

Next step, see our reviews of the best air purifiers in India.

Happy shopping!

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